The library at Marymount provides students and teachers with the information and resources they need to be academically successful. To this end, the library complements its 18,000-volume book collection with extensive digital resources.

The New York Public Library has many branches throughout Manhattan, the Bronx, and Staten Island. Any person who lives, works, attends school, or pays property taxes in New York State is eligible to receive a New York Public Library card free of charge and can check out materials. Brooklyn Public Library and the Queens Library also have local public branches.